Along with 5 compulsory papers for the mains exam (two for general studies, one for essay, one for qualifying English and one for a language from 18 optional languages), candidate has to choose two subjects from a list of 25 optional subjects. Following are the not allowed combinations in the UPSC syllabus-

-> Political Science & International relations and Public Administration,
-> Commerce & Accountancy and Management,
-> Anthropology and Sociology,
-> Mathematics and Statistics,
-> Agriculture and Animal Husbandry & Veterinary Science,
-> Management and Public Administration,
-> Any TWO branches of Engineering,
-> Medical Science and Animal Husbandry & Veterinary Science,
-> Combination of TWO Literature

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